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Abstract:

A radio repeating system has first and second radio terminals, a radio
repeater to receive a signal transmitted from the first radio terminal
and transmit the signal to the second radio terminal, and a controller to
control the radio repeater. The controller has a terminal signal
determiner to detect a signal from the first radio terminal to determine
whether the first radio terminal is in a transmission halt mode or a
transmission mode, a first counter to start counting when a result of
detection is the transmission halt mode, and a second counter to start
counting when a result of detection is the transmission mode. The
controller halts a wireless relay operation of the radio repeater when
the result of detection is the transmission halt mode while the second
timer is operating, or when the first timer finishes counting.

Claims:

1. A radio repeating system comprising: a first radio terminal for
transmission, having a half-duplex communication function; a second radio
terminal for reception, having a half-duplex communication function; a
radio repeater to receive a signal transmitted from the first radio
terminal and transmit the signal to the second radio terminal by relay
transmission; and a controller to control the radio repeater, wherein the
controller includes: a terminal signal determiner to detect a signal from
the first radio terminal to determine whether the first radio terminal is
in a transmission halt mode or a transmission mode; a first counter to
start counting when the terminal signal determiner determines that the
first radio terminal is in the transmission halt mode and continue
counting a predetermined first time; and a second counter to start
counting when the terminal signal determiner determines that the first
radio terminal is in the transmission mode and continue counting a
predetermined second time, wherein the controller halts a wireless relay
operation of the radio repeater when the terminal signal determiner
determines that the first radio terminal is in the transmission halt mode
while the second timer is operating, or when the first timer finishes
counting of the first time.

2. The radio repeating system according to claim 1, wherein the
controller halts and resets the first timer when the terminal signal
determiner determines that the first radio terminal is in the
transmission mode while the first timer is operating.

3. A radio repeating apparatus comprising: a radio repeater to receive a
signal transmitted from a radio terminal and transmit the signal by relay
transmission; a terminal signal determiner to detect a signal from the
radio terminal to determine whether the radio terminal is in a
transmission mode or a transmission halt mode; a first counter to start
counting when the terminal signal determiner determines that the radio
terminal is in the transmission halt mode and continue counting a
predetermined first time; and a second counter to start counting when the
terminal signal determiner determines that the radio terminal is in the
transmission mode and continue counting a predetermined second time; and
a controller to halt a wireless relay operation of the radio repeater
when the terminal signal determiner determines that the radio terminal is
in the transmission halt mode while the second timer is operating, or
when the first timer finishes counting of the first time.

4. The radio repeating apparatus according to claim 3, wherein the
controller halts and resets the first timer when the terminal signal
determiner determines that the radio terminal is in the transmission mode
while the first timer is operating.

5. A method of operating a radio terminal equipped with a push-to-talk
switch that switches operations between a transmission mode by depressing
and a transmission halt mode by releasing, the radio terminal performing
communications via a radio repeating apparatus that continues a relay
operation for a predetermined time when a signal from the radio terminal
is halted, the method comprising the steps of: releasing the push-to-talk
switch of the radio terminal in the transmission mode to halt
transmission to the radio repeating apparatus; depressing the
push-to-talk switch while the radio repeating apparatus continues the
relay operation to put the radio terminal in the transmission mode; and
releasing the push-to-talk switch before a predetermined time to put the
radio terminal in the transmission halt mode, thus finishing the relay
operation of the radio repeating apparatus.

6. A radio repeating method comprising the steps of: a step of relaying
half-duplex communications, by a radio repeating apparatus, between a
plurality of radio terminals; a first detecting step of detecting a
transmission signal, by the radio repeating apparatus, from any of the
radio terminals; a first determining step of determining whether the
transmission signal is in a transmission halt mode or a transmission
mode, based on a first result of detection in the first detecting step; a
first start step of starting counting at a first timer while the radio
repeating apparatus continues a relay operation when it is determined, in
the first determining step, that the transmission signal is in the
transmission halt mode; a second detecting step of detecting a
transmission signal from any of the radio terminals while the first timer
is counting; a second determining step of determining whether the
transmission signal is in the transmission halt mode or the transmission
mode, based on a second result of detection in the second detecting step;
a second start step of starting counting at a second timer whereas
resetting the first timer while the radio repeating apparatus continues a
relay operation when it is determined, in the second determining step,
that the transmission signal is in the transmission mode before the first
timer finishes counting; a third detecting step of detecting a
transmission signal from any of the radio terminals before the second
timer finishes counting; a third determining step of determining whether
the transmission signal is in the transmission halt mode or the
transmission mode, based on a third result of detection in the third
detecting step; and halting a relay operation of the radio repeating
apparatus when it is determined, in the third determining step, that the
transmission signal is in the transmission halt mode before the second
timer finishes operating, or when the first timer finishes counting.

7. The radio repeating method according to clam 6 further comprising the
step of continuing a relay operation of the radio repeating apparatus
when the second timer finishes counting.

Description:

BACKGROUND OF THE INVENTION

[0001] The present invention relates to a radio repeating system, a radio
repeating apparatus, a radio terminal operating method, and a radio
repeating method.

[0002] A radio repeating system is known in which a pair of radio
terminals communicate with each other under a relay operation by a radio
repeating apparatus. The radio repeating apparatus is implemented with a
timer function for keeping a relay transmission mode for a predetermined
time and allowing occupation of a channel used at present when the radio
terminals finish transmission.

[0003] A time during which a timer function allows channel occupation is
referred to as a hold time.

[0004] Even if a pair of radio terminals finish communications, the radio
repeating apparatus occupies the channel because the apparatus continues
a relay transmission operation, which leads to a problem in that other
radio terminals cannot use the radio repeating apparatus.

[0005] A scheme to solve this problem is a method in which an end key
implemented in a radio terminal is operated to transmit an end command to
finish the hold time and release an occupied channel.

[0006] The configuration with the end key described above forces a radio
terminal to have a specific function, thus raising a cost. Moreover, it
is complex and time consuming because operations such as recognizing and
pushing the end key are required.

SUMMARY OF THE INVENTION

[0007] In view of the foregoing problems, it is a purpose of the present
invention to provide a radio repeating system, a radio repeating
apparatus, a radio terminal operating method, and a radio repeating
method to finish a hold time with no particular function to be
implemented in a radio terminal.

[0008] The present invention provides a radio repeating system comprising:
a first radio terminal for transmission, having a half-duplex
communication function; a second radio terminal for reception, having a
half-duplex communication function; a radio repeater to receive a signal
transmitted from the first radio terminal and transmit the signal to the
second radio terminal by relay transmission; and a controller to control
the radio repeater, wherein the controller includes: a terminal signal
determiner to detect a signal from the first radio terminal to determine
whether the first radio terminal is in a transmission halt mode or a
transmission mode; a first counter to start counting when the terminal
signal determiner determines that the first radio terminal is in the
transmission halt mode and continue counting a predetermined first time;
and a second counter to start counting when the terminal signal
determiner determines that the first radio terminal is in the
transmission mode and continue counting a predetermined second time,
wherein the controller halts a radio relay operation of the radio
repeater when the terminal signal determiner determines that the first
radio terminal is in the transmission halt mode while the second timer is
operating, or when the first timer finishes counting of the first time.

[0009] Moreover, the present invention provides a radio repeating
apparatus comprising: a radio repeater to receive a signal transmitted
from a radio terminal and transmit the signal by relay transmission; a
terminal signal determiner to detect a signal from the radio terminal to
determine whether the radio terminal is in a transmission mode or a
transmission halt mode; a first counter to start counting when the
terminal signal determiner determines that the radio terminal is in the
transmission halt mode and continue counting a predetermined first time;
and a second counter to start counting when the terminal signal
determiner determines that the radio terminal is in the transmission halt
mode and continue counting a predetermined second time; and a controller
to halt a radio relay operation of the radio repeater when the terminal
signal determiner determines that the radio terminal is in the
transmission halt mode while the second timer is operating, or when the
first timer finishes counting of the first time.

[0010] Furthermore, the present invention provides a method of operating a
radio terminal equipped with a push-to-talk switch that switches
operations between a transmission mode by depressing and a transmission
halt mode by releasing, the radio terminal performing communications via
a radio repeating apparatus that continues a relay operation for a
predetermined time when a signal from the radio terminal is halted, the
method comprising the steps of: releasing the push-to-talk switch of the
radio terminal in the transmission mode to halt transmission to the radio
repeating apparatus; depressing the push-to-talk switch while the radio
repeating apparatus continues the relay operation to put the radio
terminal in the transmission mode; and releasing the push-to-talk switch
before a predetermined time to put the radio terminal in the transmission
halt mode, thus finishing the relay operation of the radio repeating
apparatus.

[0011] Still, furthermore, the present invention provides a radio
repeating method comprising the steps of: a step of relaying half-duplex
communications, by a radio repeating apparatus, between a plurality of
radio terminals; a first detecting step of detecting a transmission
signal, by the radio repeating apparatus, from any of the radio
terminals; a first determining step of determining whether the
transmission signal is in a transmission halt mode or a transmission
mode, based on a first result of detection in the first detecting step; a
first start step of starting counting at a first timer while the radio
repeating apparatus continues a relay operation when it is determined, in
the first determining step, that the transmission signal is in the
transmission halt mode; a second detecting step of detecting a
transmission signal from any of the radio terminals while the first timer
is counting; a second determining step of determining whether the
transmission signal is in the transmission halt mode or the transmission
mode, based on a second result of detection in the second detecting step;
a second start step of starting counting at a second timer whereas
resetting the first timer while the radio repeating apparatus continues a
relay operation when it is determined, in the second determining step,
that the transmission signal is in the transmission mode before the first
timer finishes counting; a third detecting step of detecting a
transmission signal from any of the radio terminals before the second
timer finishes counting; a third determining step of determining whether
the transmission signal is in the transmission halt mode or the
transmission mode, based on a third result of detection in the third
detecting step; and halting a relay operation of the radio repeating
apparatus when it is determined, in the third determining step, that the
transmission signal is in the transmission halt mode before the second
timer finishes operating, or when the first timer finishes counting.

BRIEF DESCRIPTION OF DRAWINGS

[0012] FIG. 1 is an outline view of a radio repeating system according to
an embodiment of the present invention;

[0013]FIG. 2 is a block diagram of a configuration of a radio repeating
system according to an embodiment of the present invention;

[0014]FIG. 3 is an exemplary block diagram of a configuration of a radio
terminal according to the present invention;

[0015]FIG. 4 is a view showing locations at which a push-to-talk switch
of a radio terminal according to the present invention is installed;

[0016]FIG. 5 is a view showing time charts for explaining operations of a
radio terminal according to an embodiment of the present invention; and

[0017]FIG. 6 shows a flowchart for explaining operations of a radio
repeating system according to an embodiment of the present invention.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

[0018] A radio repeating system, a radio repeating apparatus, a radio
terminal operating method, and a radio repeating method according to the
present invention will be described with reference to the attached
drawings. The structural elements, type, combination, shape, and their
relative positioning described in the embodiments are merely examples,
without limiting the scope of the present invention, as far as there is
no particular description.

[0019] FIG. 1 is an outline view of a radio repeating system according to
an embodiment of the present invention.

[0020] In FIG. 1, radio terminals 200A to 200D are half-duplex radio
apparatuses, the transmission being conducted by user operations. The
radio terminals 200A to 200D may be referred to as a radio terminal 200
as a generic name if necessary.

[0021] A radio repeating apparatus 100 receives a signal transmitted by
the radio terminal 200A and transmits the signal to the radio terminal
200B, a communications company, by relaying the signal. Since the radio
terminals 200A and 200B can interactively communicate with each other,
the radio repeating apparatus 100 receives a signal transmitted from the
radio terminal 200B and transmits the signal to the radio terminal 200A,
a communications company, by relaying the signal.

[0022] The radio terminals 200C and 200D are waiting until the radio
terminals 200A and 2008 finish communications relayed by the radio
repeating apparatus 100.

[0023]FIG. 2 is a block diagram of a configuration of a radio repeating
system according to an embodiment of the present invention.

[0024]FIG. 2 shows only the radio repeating apparatus 100 and the radio
terminals 200A and 2008 communicating with each other via the radio
repeating apparatus 100. Moreover, FIG. 2 shows that the radio terminal
200A is in a transmission mode while the radio terminal 200B is in a
reception mode.

[0025] The radio repeating apparatus 100 is provided with a radio repeater
100A and a controller 1006. The radio repeater 100A is provided with a
receiver 101 and a transmitter 102. The controller 100B is provided with
a terminal signal determiner 103 and timers 105 and 106.

[0026]FIG. 3 is a block diagram of a configuration of the radio terminal
200.

[0027] The radio terminal 200 is constituted by an antenna 201, antenna
switch 202, a receiver 203, a speaker 204; a microphone 205, a
transmitter 206, a push-to-talk (PTT) switch 207 (abbreviated to PTT 207,
hereinafter), and a controller 208.

[0028] An operation of the radio terminal 200 is described with reference
to FIG. 3.

[0029] The antenna 201 receives a signal from the radio repeating
apparatus 100. The antenna switch 202 is turned to an R side when
reception, to send the received signal received by the antenna 201 to the
receiver 203 whereas to a T side when transmission, to send a
transmission signal from the transmitter 206 to the antenna 201. The
switching is performed by the controller 208.

[0030] The receiver 203 amplifies the received signal, reduces disturbance
components, detects the received signal, demodulates the detected signal,
and converts the demodulated signal into an audio signal. The audio
signal is fed to the speaker 204. The speaker 204 outputs audio.

[0031] The microphone 205 converts voices of a user into an audio signal
and inputs the audio signal to the transmitter 206. The transmitter 206
modulates the audio signal into a modulated wave, amplifies the modulated
wave, and eliminates spurious components, thus converting the modulated
wave into a transmission signal. The transmission signal is output from
the antenna 201 via the antenna switch 202.

[0032] The radio terminal 200 is put in the transmission mode when the PTT
207 is depressed (turned on) whereas in the reception mode when the PTT
207 is released (turned off)

[0033] While the PTT 207 is being off, the controller 208 supplies power
from a power supply (not shown) to the receiver 203 and sets several data
necessary for reception in the receiver 203. In contrast, while the PTT
207 is being on, the controller 208 supplies power from a power supply
(not shown) to the transmitter 206 and sets several data necessary for
transmission in the transmitter 206.

[0034] The radio terminal 200 is put in the reception mode while the PTT
207 is being off and a signal is being transmitted from the radio
repeating apparatus 100. In contrast, when there is no signal from the
radio repeating apparatus 100 or a control signal from the radio
repeating apparatus 100 is not for the radio terminal 200, the radio
terminal 200 is put in a standby mode and the controller 208 controls the
receiver 203 to mute audio output from the speaker 204.

[0035] When the radio terminal 200 is a portable device, as shown in (a)
of FIG. 4, the PTT 207 is mostly attached to the side face of the body
for easy one-hand operation. When the radio terminal 200 is an mobile
device, as shown in (b) of FIG. 4, the PTT 207 is attached to the side
face of a hand microphone 300 or, as shown in (c) of FIG. 4, the PTT 207
is provided in a specific location, for example, fixed to a pillar 301 so
that an operation of a shift lever 302, a staring wheel 303, etc., is
easily made during driving.

[0036] An operation of the radio repeating apparatus 100 is described with
reference to FIG. 2 in the case where the radio repeating apparatus 100
receives a signal transmitted from the radio terminal 200A and transmits
it to the radio terminal 200B.

[0037] In FIG. 2, the receiver 101 receives a transmission signal of the
radio terminal 200A. The receiver 101 reduces components of a received
signal, detects the received signal, and demodulates the detected signal
to obtain an audio data signal and a control data signal. The audio data
signal is input to the transmitter 102 whereas the control data signal is
input to the controller 1008.

[0038] The controller 100B analyzes the demodulated control data signal,
constructs a control data signal necessary for communications with the
radio terminal 200B, and sends the control data signal to the transmitter
102.

[0039] The transmitter 102 modulates the control data signal necessary for
communications with the radio terminal 200Ba and the demodulated audio
data signal to convert them into a transmission signal, amplifies the
transmission signal, reduces disturbance components, and transmits the
amplified signal to the radio terminal 200B.

[0040] The controller 100B analyzes information included in the received
control data signal, such as ID information indicating the type of the
radio terminals 200A and 200B, to construct data on relay transmission
and perform control necessary for operations of the receiver 101 and
transmitter 102.

[0041] The terminal signal determiner 103 determines whether the radio
terminal 200A is in a transmission halt mode or a transmission mode
depending on whether there is a synchronizing signal from the radio
terminal 200A. The determination may be performed with detection of field
strength, bit error, etc., besides synchronizing signal, thus not
limited.

[0042] When the terminal signal determiner 103 determines that the radio
terminal 200A halts transmission, the controller 100B instructs the timer
105 to start counting a predetermined time. On the other hand, when the
terminal signal determiner 103 determines that the radio terminal 200
performs transmission, the controller 100B instructs the timer 106 to
start counting a predetermined time. Since the timer 106 starts counting
when transmission from the radio terminal 200A is received, it may count
the number of synchronizing signals used for determination at the
terminal signal determiner 103.

[0043] The controller 100B controls the radio repeater 100A while the
timer 105 is counting so that the radio repeater 100A continues a relay
operation even if there is no signal from the radio terminals 200A.

[0044] When the timer 105 finishes counting, the controller 1008 halts the
relay transmission operation of the radio repeater 100A. The duration
from the count start to end at the timer 105 is a hold time.

[0045] When an embodiment of radio repeating system is achieved to be a
digital system, relay transmission is in a no modulation mode during the
hold time. Nevertheless, a synchronizing signal such as a sync word is
transmitted.

[0046] An operation of the controller 100B is described with reference to
FIG. 5. Shown in (a) of FIG. 5 is a time chart for the case where the
hold time is complete. Shown in (b) of FIG. 5 is a time chart for the
case where the hold time is cancelled by an operation at the radio
terminal 200A.

[0047] In (a) of FIG. 5, a user of the radio terminal 200A turns off the
PTT 207 at a timing T1 to finish the transmission and keeps a reception
mode.

[0048] When the transmission from the radio terminal 200A is halted, the
timer 105 starts counting and then the radio repeating apparatus 100
keeps a relay transmission mode for a duration (the hold time) from the
timing T1 to a predetermined timing T2.

[0049] The radio repeating apparatus 100 finishes a relay transmission
operation if the hold time (T1-T2) elapses with no response from the
radio terminal 200B or no resumption of transmission by the radio
terminal 200A. The radio terminals 200A and 200B are released from the
reception mode and put in a standby mode due to the halt of a signal from
the radio repeating apparatus 100.

[0050] In (b) of FIG. 5, the user of the radio terminal 200A turns off the
PTT 207 at the timing T1 to finish the transmission and keeps a reception
mode.

[0051] The timer 105 starts counting when the transmission from the radio
terminal 200A is halted.

[0052] The user depresses the PTT 207 for a very short period and releases
it at timings T3 to T4 for a normal transmission operation. The operation
of the PTT 207 for such a short period is referred to as one-push.

[0053] When the radio terminal 200A is put in a transmission mode at the
timing T3 before the timing T2 at which the hold time is complete, since
it is still the hold time, the radio repeating apparatus 100 halts and
resets the timer 105 and instructs the timer 106 to start counting.

[0054] Either of halt and resetting of the timer 105 and count start of
the timer 106 may be performed first or both may be performed at the same
time.

[0055] The timer 106 finishes counting at a timing T5. However, if the
radio terminal 200A finishes transmission at the timing T4 before the
completion of counting, the radio repeating apparatus 100 halts and
resets the timer 106 and finishes a relay transmission operation.

[0056] The radio terminals 200C and 200D have been in a communication
standby mode because the radio repeating apparatus 100 has been in use.
However, since the relay transmission operation is complete for the
communications between the radio terminals 200A and 200B, the radio
terminal 200C is allowed to start transmission at a timing T6 without
waiting for the timing T2 for completion of the hold time.

[0057] The radio repeating apparatus 100 starts a relay transmission at a
timing T7.

[0058] The radio terminal 200D receives the relay transmission from the
radio repeating apparatus 100 and confirms whether it is the
communication to itself, and when it is confirmed, releases muting at a
timing T9 to reproduce received audio.

[0059]FIG. 6 shows a flowchart for the control in the radio repeating
apparatus 100, that is an embodiment of a radio repeating method.

[0060] The radio terminals 200A and 200B are communicating each other via
the radio repeating apparatus 100 and the receiver 101 of the radio
repeater 100A is receiving a transmission signal from the radio terminal
200A (step S401).

[0061] The controller 100B detects a synchronizing signal in a received
signal and the terminal signal determiner 103 determines, based on a
result of the detection, whether the radio terminal 200A comes in a
transmission halt mode or remains in a transmission mode, and when it is
determined that the radio terminal 200A comes in the transmission halt
mode (YES in step S402), instructs the timer 105 to start counting, thus
continuing a relay operation (step S403). Even while the timer 105 is
counting, the terminal signal determiner 103 continues detection of a
transmission signal from the radio terminal 200A or 200B (step S404).

[0062] When no transmission signal is detected from the radio terminal
200A or 200B (NO in step S404) and when the timer 105 finishes counting
(YES in step S405), the controller 100B of the radio repeating apparatus
100 determines that the communication is complete and then the radio
repeating apparatus 100 finishes the relay operation (step S406). When
counting at the timer 105 is not complete yet (NO in step S405), the
process returns to step S404 in which the terminal signal determiner 103
continues detection of signals.

[0063] When a transmission signal from the radio terminal 200A or 200B is
received before the timer 105 finishes counting (YES in step S404), the
controller 100B halts and resets the timer 105, and instructs the timer
106 to start counting (step S407). The controller 100B may halt and reset
the timer 105 before instructing the timer 106 to start counting or vise
versa, or simultaneously.

[0064] When a signal from the radio terminal 200A or 200B is halted while
the timer 106 is counting (YES in step S408), the controller 100B halts
and resets the timer 106 (step S409), and then finishes the relay
operation (step S406).

[0065] When a signal from the radio terminal 200A or 200B is not halted
(NO in step S408), the controller 100B determines whether the timer 106
finishes counting (step S410).

[0066] When the timer 106 is counting (NO in step S410), the radio
repeater 100A continues the relay operation and the terminal signal
determiner 103 of the controller 100B continues detection of signals from
the radio terminal 200A or 200B (step S408).

[0067] On the contrary, when the timer 106 finishes counting (YES in step
410) while a signal from the radio terminal 200A or 200B is not halted
(NO in step S408), the controller 100B determines that the radio
terminals 200A and 200B continue communications and thus continues the
relay operation (step S401).

[0068] As described in detail, the relay operation at the radio repeating
apparatus 100 can be released during the hold time by one-pushing the PTT
207 with no transmission or operation of specific commands at the radio
terminals 200A and 200B.

[0069] The function of releasing the hold time described above can be
achieved with modifications to the software of the controller 100B of the
radio repeating apparatus 100, namely, the function of releasing the hold
time can be achieved with a currently used radio terminal with no
necessity of preparing a new radio terminal implemented with an end key.

[0070] With the function of releasing the hold time described above, a
user of the radio terminal 200 can halt the relay operation of the radio
repeating apparatus 100 to release a channel currently in use, thus
shortening the time occupying the channel, by one-pushing the PTT 207 at
the completion of communications.

[0071] Therefore, when the hold time is not necessary, it is released from
the radio terminal 200, thus achieving higher use efficiency for the
radio repeating apparatus 100.

[0072] The controller 100B may be provided outside the radio repeating
apparatus 100. Moreover, any of the terminal signal determiner 103 and
the timers 105 and 106 may be provided outside the controller 100B.

[0073] As described above in detail, the hold time of the radio repeating
apparatus can be halted with no particular function implemented at the
radio terminal or particular operation thereof, according to the present
invention.